Screw gutting lathe



4 Sheets-Shet I..

(No Model.)

J. W. SEE. SCREW CUTTING LATHE.

Patented Nov. 7, 1882.

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WITNESSES:

(N0 Model.) 4 Sheets-Sheet 2.

J. W'. SEE.

SCREW CUTTING LATHE. No. 267,026. Patented NQV. 7, 1882* W v i mv m WWW-$95; M G

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4 Sheets-Sheet 3* J. W. SEE.

SCREW CUTTING LATHE.

(No Model.)

Patented Nov. 7,188 2 S fNVEA/TOR W] T ZZSSES N. PETERS? Pholo-Liimgnphw. Wnhinghm. D. C.

(No Model.) 4 Sheets-Sheet 4 J. W. SEE.

SCREW CUTTING LATHE.

No. 267,026. Patented Nov. 7, 1882.

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UNITED STATES PATENT @FFICE.

JAMES W. SEE, OF HAMILTON, OHIO, ASSIGNOR TO THE h'llLES TOOL WORKS, OF SAME PLACE.

SCREW-CUTTING LATHE.

SPECIFICATION forming part of Letters Patent No. 267,026, dated November 7, 1882.

Application filed May 19, 1882. (N0 model.)

To all whom it may concern Be it known that 1, JAMES W. SEE, of Hamilton, in the county of Butler and State of Ohio, have invented certain new and useful Improvements in Screw-Cutting Lathes, of which the following is a specification.

This invention pertains to lathes for cutting long screws; and itrelates to the arrangement of the feed-screw, to the construction of the duplex tool-rest, to the apparatus for supplying liquid to'the tools, and to a novel arrangement of intermediate rests to sustain the work.

In the accompanying drawings, Figure 1 is a front elevation of a lathe embodying myimprovements. Fig. 2 is a transverse section of part of the lathe-bed, showing the construc tion of the swinging rests. Fig. 3 is a. transverse vertical section of the main tool-block Fig. 4c, a plan of the same; Fig. 5, aside elevation of the tool-rest; Fig. 6, a vertical section of the water-cock; Fig. 7, a perspective view of the water cock disk, and Fig. 8 a vertical section of the main tool-block.

In Fig. 1, R is the lead-screw, supported in the usual gutter, S. In cutting very long screws thereis considerable torsion of the work. As the cutting-tool progresses the twisted work behind it untwists,aud this untwistingslightly increases the pitch of the thread which has been cut. The efi'ect of torsion is as the length of the pieces. Hence a thread of a constant pitch out upon a bar with a torsion lessening toward the driven end will result in a thread whose pitch decreases toward the driven end. The pitch will coincide with the leading-screw only at a point where there is no torsion of the work. I remedy this matter somewhat by constructing thelead-screw with a thread increasing in pitch as it progresses, and I, arrange this lead-screw with its fine-pitch end farthest away from the driving endot' thelathe. Thus in Fig. l the lead-screw R has a pitch of thread finer at R than at R. this lead-screw it is cut, as usual, in a lathe, and then set with its fine end toward the tail of the lathe.

In Fig. 1, L and L are intermediate rests, arranged to support the work at various points and to be easily swung out of the way to permit the carriage to pass. They swing in sockets back of the lathe, and may be easily re- In the production of moved from the sockets and placed in other sockets in different positions along the'length ot' the lathe. Fig. 2 shows the construction of these rests. A curved crane-like arm, P, is vertically pivoted in a socket, 'W, fixed to the back of the lathe-bed, and is provided at its upper end with a V-shaped hearing, M, to support the work. The hearing M has a threaded shank, Q, which, in connection with the nuts 0, permits the bearing to be adjusted vertically to suit difl'erent diameters of work. The bearing M is support-ed in a sleeve, V, which is adapted to slide vertically in the end of the arm and be quickly raised or lowered by the cam-lever N or other suitable device, so that in swinging the arm from under the work the sides of the bearing M will clear. An arrangement whereby the passage of the carriage automatically operates the swing-rests is reserved as the subject of another patent. The rest is duplex in character, arranged to cut on both the forward and backward motions, and two tools may, if desired, be used during each cut.

B is thelathe-carriage; O, a cross-sliding block, and J the usual cross-screw. As seen in Fig. 5, a stop;j, is fixed to the saddle, and a double-collared stop-stud, K K, is fixed in the block 0 to operate in connection with this standard. The effect of this double-stop device'is to limit the motion of the block 0. The cross-screw J can thus only move the block O a slight distance-about an inch, or enough to withdraw the cutting-tools entirely from the thread being out.

The tool-posts E are carried in secondary tool-blocks,D and d, as shown, they being adjustable for depth of cut by the screws a and b,

both being, as shown, accesssihle from the front.

in operation the cross-screw J is used at each reverse of the lathe-motion to move the block 0 the full limit allowed by the stopj, and the advance of the tools for an increased depth of cut is effected by the screws a and 1).

Suitable forms of follow-rests are of course to be secured to the carriage.

The main block 0 is hollow and forms a watertank, m. A gutter, g, around its top, catches the water dri'ppingfroin the toolsand drains it through holes I1. into the tank m. A

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2 ecaoec pipe, I, attached to the tank m, carries the Water-cup G, from. Which the Water flows through cock H to the tools. In the tank m is fixed a pump having a handle, F. This pump transfers the water from the tank on to the cup G. The cup G is arranged to hold no more than the tank m will hold, whereby the tank on can never be overflowed. The cup G is replenished from the tank at from time to time and wastage made up by pouringinto the cup. at is the check-valve for the pump. The cup G has a bottom hub, v, titted to turn on the pipe I, so the drip-cock H can be swung around. The location of the check-valve u in the cup G above this rotary joint prevents any leak at the joint when no pumping is being done, and capillary-grooves in the hub will prevent leak during pumping.

The drip-cock H is shown plainly in Figs. 6 and 7. t

The flowpipe t is bent downward and threaded, and onto the threaded part is screwed a' sleeve, H, having a milled rim and an outletnozzle. The end of the pipe is nicely faced to- 2. The combination, with a screw cutting lathe, of the stvingrests L, having verticallyadjustable bearings M to support the Work.

3. The combination of a hollow tool-block, a gutter to drain thereinto, a hand-pump at tached thereto, a water-cup supported thereby, and a pipe connecting the stantially as set forth.

4. In a drip-cock for a lathe, the combination of milled sleeve H, threaded pipe t, and disk-seat 20, substantially as set forth.

, JAMES W. SEE.

Witnesses:

GEORGE H. HELVEY,

JOHN LORENZ.

pump and cup, sub- 

